Cak-wheel



J. PUGH.

Car Wheei.

Patentd June 15, 1858.

M PETERS. PHOTKLLITHOGRAPHER WASNKNGTON D C UNITED STATES PATENT OFFICE.

JNO. PUGH, OF FRANKLIN, TENNESSEE.

GAR-WHEEL.

Specification of Letters Patent No. 20,588, dated June 15, 1858.

To all whom "it may concern:

Be it known that I, Jorrx PUGH, of Franklin, in the county of lVilliamson and State of Tennessee, have invented a new and useful Improvement in Car-Wheels or Vheels of Railway and other Carriages; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings of the same, making part of this specification.

Figure 1, is a side elevation of car wheel formed after the improved manner. Fig. 2, is a vertical transverse section of ditto at the dotted line 1, 1, of Fig. 1. Fig. 3, is a vertical longitudinal section of the same at the dotted line 2, 2, of Fig. 2.

Similar letters in the figures refer to corresponding parts.

The nature of this invention consists in employing solid wrought iron spokes, surrounded by and inclosed within hollow wrought iron spokes of a shorter length, in such a manner as to enable the outer segments or rim of the wheel, and the inner sections of the inner portion of the same, to be cast around the ends of said spokes, and to shrink in cooling, independent of each other, and the hub to be subsequently cast within and around the inner ends of said spokes, after the rim has been cooled.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and manner of forming the same.

The wrought iron spokes A, to the number desired, are surrounded by corresponding hollow spokes B, which exactly fit the same, the two being arranged radially from a common center and the inner spokes A, made to project some distance beyond the outer ones, at the outer extremities, and about half this distance past their inner ends. This unequal termination of the spokes at their outer ends, brings the ends of the inner ones A, on a line with the inner portion of the segments forming the tread of the Wheel, while the ends of the outer spokes B, are brought within the circle of the segments forming the inner portion of the rim. This characteristic, causes the extremities of the inner spokes to receive the shrinkage of the outer portion of the rim, and the ends of the outer ones to receive the shrinkage from the inner portions of the same, and thereby enables the contraction of the two portions in cooling to be independent of each other. In pouring the melted metal, during the casting of the wheel, it is made to flow around the rounded ends of the spokes A, in such a manner as to form a ridge or fillet g, at this port-ion, which shall serve as a support, but at the same time to leave a space 71., around the ends between said ridge or fillet, and the solid metal connected with the inner portion of the rim or segment, next the ends of the hollow spokes B, so as to allow the full and complete contract-ion of one portion without interfering with that of the other.

After the rim of the wheel has cooled, the hub C, is cast within and around the inner ends of the spokes A, B, and by thus making this operation subsequent to the first, and after the outer extremities have been permanently fixed, the pouring or cooling of the metal of the hub portion, is prevented from affecting the rim of the wheel.

The employment of the wrought iron spokes A, B, in the manner described above, not only relieves the inner and outer cast portions of the rim of the wheel from all strain, caused by the unequal contraction in cooling of the two masses of metal of difierent volumes, of which said inner and outer sections are respectively composed, but also enables the wheel to. be made more strong and durable, than by the methods of manufacture now in use.

What I claim as new and desire to secure by Letters Patent, is,

The employment of the hollow or tubular spoke B, combined with the solid spoke A, for the purpose of respectively receiving the strain arising from the unequal contraction in cooling of the different volumes of metal in the inner and outer sections E, D, or portions of the rim, independent of each other, in the manner herein described.

JOHN PUGI-I. Witnesses:

H. FAUNTLEROY,

J. B. CLoUGH,

A. ANDERSONv 

